test: run Temporal presence checks without runtime flag

[Renegade334]

v26.x should expose the Temporal global without requiring the V8 flag.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.64%. Comparing base (4247cd3) to head (acdfc6a).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #63028      +/-   ##
==========================================
- Coverage   89.65%   89.64%   -0.01%     
==========================================
  Files         708      708              
  Lines      220374   220374              
  Branches    42265    42270       +5     
==========================================
- Hits       197567   197562       -5     
+ Misses      14670    14662       -8     
- Partials     8137     8150      +13     

see 46 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73018/